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Changes in phosphine sorption in wheat after storage at two temperatures.

Daglish, G.J. and Pavic, H. (2009) Changes in phosphine sorption in wheat after storage at two temperatures. Pest Management Science, 65 (11). pp. 1228-1232.

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Article Link(s): http://dx.doi.org/10.1002/ps.1814

Publisher URL: http://www.wiley.com
Organisation URL: http://www.soci.org

Abstract

BACKGROUND: Wheat can be stored for many months before being fumigated with phosphine to kill insects, so a study was undertaken to investigate whether the sorptive capacity of wheat changes as it ages. Wheat was stored at 15 or 25C and 55% RH for up to 5.5 months, and samples were fumigated at intervals to determine sorption. Sealed glass flasks (95% full) were injected with 1.5 mg L-1 of phosphine based on flask volume. Concentrations were monitored for 11 days beginning 2 h after injection. Some wheat samples were refumigated after a period of ventilation. Several fumigations of wheat were conducted to determine the pattern of sorption during the first 24 h.

RESULTS: Phosphine concentration declined exponentially with time from 2 h after injection. Rate of sorption decreased with time spent in storage at either 15 or 25C and 55% RH. Rate of sorption tended to be lower when wheat was refumigated, but this could be explained by time in storage rather than by refumigation per se. The data from the 24 h fumigations did not fit a simple exponential decay equation. Instead, there was a rapid decline in the first hour, with phosphine concentration falling much more slowly thereafter.

CONCLUSIONS: The results have implications for phosphine fumigation of insects in stored wheat. Both the time wheat has spent in storage and the temperature at which it has been stored are factors that must be considered when trying to understand the impact of sorption on phosphine concentrations in commercial fumigations.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, QPIF
Business groups:Agri-Science, Crop and Food Science
Additional Information:© The State of Queensland (through the Department of Employment, Economic Development and Innovation).
Keywords:Fumigant insecticides; phosphine; sorption; storage; temperature; wheat; Triticum; field crops; pesticides; food storage.
Subjects:Plant pests and diseases > Individual or types of plants or trees > Wheat
Agriculture > Agriculture (General) > Storage
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Deposited On:22 Jun 2010 06:30
Last Modified:27 Oct 2011 00:59

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